Hi, can a Multi RS Solar be AC coupled in the AC-out of a Multiplus II in an off-grid system, like you can do with a Fronius PV inverter?
Thanks
That is referred to as cascading inverters.
It is not supported, but people do it.
Each needs its own battery system and are independent systems, unaware of the other.
Why is it not supported if the same with Fronius is supported?
Does the RS inverter appear in VRM dashboard like the Fronius?
Do you connect RS to Cerbo via Can bus like you do with Fronius?
Thanks
Fronius is a PV inverter, with no batteries, and that is controlled via frequency shifting/GX to control power.
It is a tested and supported configuration as are other PV inverters that use the assistants and frequency shifting.
Multis, RS and Quattros are not PV inverters.
Different Victron inverters do not control each other, nor communicate, nor respond to frequency shifting. They are not designed to be coupled this way.
I suggest you read the various manuals and follow the free training on the professional.victronenergy.com site.
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Unserstood but let me ask you one more question.
As far as I lnow the new Hybrid Fronius PV inverters, i think they are the Gen24 family, support a storage battery.
Why do they work if they also have a battery and the VE inverters not?
Thanks once more
I don’t know if that influences support, but they are still AC generators and integrated with the GX to control power, subject to the factor 1 rule.
Victron inverters only cooperate in parallel, split or 3 phase setups on one GX.
Independent systems cannot communicate with each other, and sharing a GX only enables some reporting, no management.
The devices have very different architectures.
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Hi @moranchoj
An AC coupled device on an AC-out of a Multiplus II, needs to be controlled at some point in regard to power generation.
It doesn’t matter why, but it needs to be (mandatory) controlled and by controlling I mean to tell it to generate more power or even to stop generating completely.
Hybrid Fronius inverters with storage battery are just like the PV versions, but instead of taking energy from solar panels, they can also take energy from batteries, if the solar is not available.
Anyway, the idea is that they (both Hybrid and PV) are designed that they can be controlled, by various methods, frequency shift being preffered, in regard with the amount of power generated.
The Multi RS is not (yet) capable of being controlled to increase or decrease its generated power by any means.
Therefore they are not suitable to be AC coupled on the AC-out of the Multiplus II.
By “yet” I mean that according with Victron, the Multi RS will be able to function in the future like a PV inverter by only updating its firmware. This is a “read-between-the-lines” supposition supported by the changelog updates of the Venus OS.
Alex
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Thanks. It would make sense that if Fronius PV inverter technology evolve to cover also some VE technology (power storage) and thus become a competitor for VE , then VE evolves too to cover PV inverters.
This will be a very good news for VE customers. Integrated solutions always are easy to manage and setup.
For sure all companies will evolve towards energy storage systems as on many countries are already becoming mandatory.
It seems that governments realized that the storage is a key feature for optimizing a national power grid.
For example my country does not offer anymore governmental aid for solar systems if they don’t include a storage capacity of at least the installed solar capacity.
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